Trivia: Very briefly in the film, you can see a computer wallpaper image with the characters Specs, Tucker and an unknown third man. This third man is actually director James Wan in a small "blink-and-you'll-miss-it" cameo.

Trivia: During the opening of the film, Lindsay Seim portrays the younger Elise in the flashback sequence. However, Lin Shaye, who plays the older Elise, dubbed over Seim's dialog in post production. Director James Wan stated that this was done because Shaye has such a unique voice, and thus, it allowed her presence to be felt early in the film.

In the scene where Josh finds René on the floor and takes and places her on the couch her head is facing upwards, but in the next shot her head is tilted and facing the camera when Josh smells her, without her head moving.